Join Michael Jensen of the Environmental Sciences Department for the 492nd Brookhaven Lecture, titled "What Goes Up Must Come Down: The Lifecycle of Convective Clouds," in Berkner Hall at 4 p.m. on Wednesday, Feb. 19. All are invited to attend this free talk, which is open to the public. Refreshments will be offered before and after the lecture. Visitors to the Lab 16 and older must carry a photo ID while on site.